Laser ablation of ternary As-S-Se glasses and clusters analysisby time of flight mass spectrometry
2010
Ternary chalcogenide As-S-Se glasses, important for optics,
computers, material science and technological applications are
often made by pulsed laser deposition (PLD) technology but the
plasma composition formed during the process is mostly unknown.
Therefore, the formation of clusters in a plasma plume from
different glasses was followed by Laser Desorption Ionization
(LDI) or Laser Ablation (LA) Time of Flight Mass Spectrometry
(TOF MS) in positive and negative ion modes. LA of glasses of
different composition leads to the formation of a number of
binary AspSq, AspSerq and ternary AspSqSer single charged
clusters. Series of clusters with the ratio As:chalcogen = 3:3
(As3S3+, As3S2Se+, As3SSe2+), 3:4 (As3S4+, As3S3Se+, As3S2Se2+,
As3SSe3+, As3Se4+), 3:1 (As3S+, As3Se+), and 3:2 (As3S2+,
As3SSe+, As3Se2+) being formed from both bulk and PLD deposited
nano-layer glass was detected. The stoichiometry of AspSqSer
clusters was determined via isotopic envelope analysis and
computer modeling. The structure of the clusters is discussed.
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